81894792 has 32 divisors (see below), whose sum is σ = 233985600. Its totient is φ = 23398464.

The previous prime is 81894779. The next prime is 81894793. The reversal of 81894792 is 29749818.

It is not an unprimeable number, because it can be changed into a prime (81894793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243567 + ... + 243902.

It is an arithmetic number, because the mean of its divisors is an integer number (7312050).

Almost surely, 2^81894792 is an apocalyptic number.

It is an amenable number.

81894792 is an abundant number, since it is smaller than the sum of its proper divisors (152090808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81894792 is a wasteful number, since it uses less digits than its factorization.

81894792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487485 (or 487481 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 81894792 is about 9049.5741336264. The cubic root of 81894792 is about 434.2622665335.

The spelling of 81894792 in words is "eighty-one million, eight hundred ninety-four thousand, seven hundred ninety-two".